If you have the liquid version 1/2cc or 1.25 mg every day would be plenty up to atleast 500mg of test. AND DONT INJECT IT!!!!!!!!!!!!!!! , i would suggest putting it in gelcaps as the liquid version tastes horrible.
Effect it in what degree? Are you taking aromatizable gear right now? It will have a great impact on estrogen related fatty deposits and water retention, but MUCH more so when using aromatizing gear...And don't inject it.
Because some people don't read the warning lables before taking things. You know, the kind of people who think taking 10 Xenadrine is 10 times better than taking 1, and wonder why they get all loopy and overdose...